Historically the mystery of an aircraft disappearing never to be seen again is not something new . Happened not that long ago in 2003 . If a 727 can disapear - why not a 777 ? No trace of 844AA has ever been found or that of the two Non Pilots supposedly on board .
"According to press reports, the aircraft began taxiing with no communication between the crew and the tower; maneuvering erratically, it entered a runway without clearance. With its lights off and its transponder not transmitting, 844AA took off to the southwest, and headed out over the Atlantic Ocean. The 727 and the two men have not been seen since."
on May 25, 2003, shortly before sunset, Padilla boarded the company’s Boeing 727-223, tail number N844AA. With him was a helper he had recently hired, John Mikel Mutantu, from the Republic of the Congo. The two had been working with Angolan mechanics to return the 727 to flight-ready status so they could reclaim it from a business deal gone bad, but neither could fly it. Mutantu was not a pilot, and Padilla had only a private pilot’s license. A 727 ordinarily requires three trained aircrew.
Its an interesting story and well worth a read . If you want conspiracy theory's this has everything you need - but the fact is no trace of this aircraft has ever been found .
http://www.airspacemag.com/history-of-flight/the-727-that-vanished-2371187/?page=1